- CREATE TABLE `people` (
- `id` INT(11) NOT NULL,
- `name` VARCHAR(50) NULL DEFAULT NULL,
- `pid` INT(11) NOT NULL DEFAULT '0',
- PRIMARY KEY (`id`)
- );
- CREATE DEFINER=`root`@`%` PROCEDURE `getChildren`(IN `parentId` INT)
- LANGUAGE SQL
- NOT DETERMINISTIC
- CONTAINS SQL
- SQL SECURITY DEFINER
- COMMENT '获取某人所有后代'
- BEGIN
- #存放结果的临时表
- DROP TABLE IF EXISTS children;
- CREATE TEMPORARY TABLE children SELECT 0 pLevel,p.* FROM `people` p WHERE id=parentId;
- #存放中间结果的临时表
- DROP TABLE IF EXISTS tem;
- CREATE TEMPORARY TABLE tem SELECT id FROM `people` limit 0;
- #逐级填充后代
- SET @pLevel=1;
- REPEAT
- #清空上次数据
- TRUNCATE TABLE tem;
- #将当前level的后代id放入临时表
- INSERT INTO tem SELECT p.id FROM `people` P, children c
- WHERE p.pid=c.id AND c.pLevel=(@pLevel-1);
- #将当前level的后代数据塞入结果临时表
- INSERT INTO children SELECT @pLevel pLevel,p.* FROM `people` p, tem t
- WHERE p.id=t.id;
- SET @pLevel=@pLevel+1;
- UNTIL NOT EXISTS (SELECT * FROM tem) OR @pLevel > 10
- END REPEAT;
- #调整表结构,删除临时列和不需要的数据
- ALTER TABLE children DROP COLUMN pLevel;
- DELETE FROM children WHERE id=parentId;
- #返回结果
- SELECT * from children;
- END
- --该片段来自于http://www.codesnippet.cn/detail/110320132378.html
来源: http://www.codesnippet.cn/detail/110320132378.html